If your CCTV system was installed after January 2017 and you are using the Hik-Connect app, this does not apply to you – unless you have a bespoke installation and some of your cameras are not connected directly to your NVR.
If however your system was installed prior to this and you are still using the HiDDNS (iVMS-4500) app, then this applies to you.
When the engineer would have installed your system, a particular set of ‘Port Forwarding’ rules would have been applied to your router. If you change, upgrade or even reset your router (broadband modem) – then these settings will become non existent, as will your ability to remote view your CCTV.
In order to resolve this, you can do one of the following:

